<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title> </title>
    <style>
        /* 通用样式选择器，一般用于重置样式 */
        * {
            margin: 0;
            padding: 0;
        }

        body {
            color: red;
        }

        a {
            color: red;
        }
    </style>
</head>

<body>
    <p>段落1</p>
    <p>段落2</p>
    <p>段落3</p>
    <p>段落4</p>
    <a href="">登录</a>
</body>

</html>